Unfortunately, copy and paste does not get me where I need to be.
To create ADA compliant documents, I need to have symantic headers, so (H1, H2, H3 . . . ) images with alt text, descriptive hyperlinks, and tables with headers. Word can handle all of this, as can more robust versions of Markdown, and of course html does it all just fine.
If I were to copy and paste, I’d have to go back and reformat everything, which would be a drag.